The man gets annoyed, slapping Finn in the head.

The man then grabs his neck, "don't make me inject you with the serum as well" he threatens

The man nodded, seeing sense in it. "Then tell me all you know" he says

"Whatever you know!" The man yelled, impatient

The man sighs, "whatever forget it", slaps him again and walks away. He turns and whispers to Sera who nods and marches over to Finn. "Get up" she says, unlocking his prison. "You're joining the rest of the prisoners to help do work" she tells him, dragging him by his shackles

(what if their friends and teammates are there too? And they perhaps tell Finn about the antidote to the chemical injected into Sera?)